JP2007237507A - Attaching device for power transmission vehicle integrated shaft, and recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a power transmission vehicle which is integrated on a shaft end to be pivotally supported by the side surface by making it crawl under a frame, and to enable the strength rigidity of the frame to be kept as well. <P>SOLUTION: This attaching device is used to pivotally supporting a shaft with which a power transmitting vehicle 36 is integrated to the frame under a state in which the power transmitting vehicle 36 is projected to the external section of the frame 20. In the attaching device, an opening section 20a for making the power transmitting vehicle crawl under is formed by punching out on the frame. At the same time, the attaching device is constituted by making the lower end of the opening section communicate with a bearing section. Also, an overhang section 20b which protrudes to the outside from a general section side surface of the frame 20 is formed on the upper edge of the opening section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mounting device for supporting a shaft, in which a power transmission wheel is integrated in advance, on a frame, and a recording apparatus including the mounting device. Here, the recording device refers to a color or monochrome printer, a copier, a scanner, or a multi-function device having two or more of these functions that executes printing in response to a print command signal from a personal computer. Examples of the method include an ink jet method, a bubble jet (registered trademark) method, and a laser method.

  2. Description of the Related Art An ink jet recording apparatus having a color printing function, a color copying function, or an image reading function in addition to these functions has recently been reduced in size and provided at low cost mainly for personal use.

For this reason, power transmission wheels such as synthetic resin gears and timing pulleys are fixed to the shaft end in advance by heat caulking or the like. A power transmission vehicle is pivotally supported on a frame in a state where the power transmission wheel is protruded from an outer portion of the frame (Patent Document 1).
In this kind of assembly work, when the shaft is a single body, it is usually sufficient to insert the shaft through the shaft hole formed in the frame, but other large parts, units, etc. in advance at the shaft position inside the frame When the shaft is assembled to the frame in the assembled state, the assembly by this kind of insertion work becomes difficult.

  As a countermeasure in this case, there is a structure in which a groove having one end communicating with the bearing portion and the other end opened to the frame edge is notched in the frame, and the shaft end is guided to the bearing portion through the notch groove. Since the notch groove opens at the edge of the frame, the strength of the frame decreases as it is. As a measure for preventing strength reduction, after the shaft is pivotally supported in the shaft hole, a reinforcing frame may be retrofitted to the frame via a rivet or the like across the notch groove portion. However, this structure has a bad appearance and increases the number of parts and man-hours due to reinforcement frames and riveting, etc., but the cost is high.Once it is assembled, the shaft cannot be removed and the maintenance is poor. is there.

  Therefore, the power transmission wheel can be inserted, and an opening portion communicating with the bearing portion is punched and formed in the frame so that the power transmission wheel is positioned on the side of the frame through the opening portion. By pivotally supporting the bearing portion, the frame strength can be maintained, and separate parts and post-processing are not required.

  FIG. 7 is a conventional schematic cross-sectional view showing a procedure for pivotally supporting a shaft with a timing pulley on the frame through an opening formed in the frame as an example. In FIG. 7, reference numeral 1 is a frame, reference numeral 2 is an opening formed in the upper part of the frame 1, reference numeral 3 is a bearing part communicating with the lower part of the opening part 2, and reference numeral 4 is a timing pulley 5 integrated at the shaft end. Is the axis. First, as shown in FIG. 7 (a), the mounting procedure in this configuration is as shown in FIG. 7 (b). In this state, as shown in FIG. The pulley 5 passes through the opening 2 and protrudes to the outside of the frame 1, and the shaft 4 is pulled up so that the joining edge of the pulley 5 and the shaft 4 is positioned at the upper edge of the opening, and then in FIG. As shown, the pulley 5 protrudes to the outside of the frame 1 by rotating the shaft 4 clockwise with the contact portion between the joint edge and the frame 1 as a rotation center point (O). Thereafter, if the shaft 4 is dropped downward while maintaining the level of the shaft 4, the shaft 4 is pivotally supported by the bearing portion 3 as shown in FIG.

JP 2005-1111677 A

  In the above mounting device, the dimension required for the opening 2 is slightly larger than the diameter of the pulley 4 in the depth direction orthogonal to the paper surface of FIG. It is necessary to make it slightly larger than the radial dimension of the shaft 4. Therefore, in the conventional structure shown in FIG. 7, when the diameter of the pulley 5 is too large with respect to the height dimension of the frame 1, this kind of structure cannot be adopted, or the upper edge and the opening of the frame 1 are not used. The vertical dimension between the upper edges of the part 2 cannot be sufficiently obtained, which causes a deterioration of the frame strength.

  Further, since such a bearing portion 3 is a groove and the upper portion side of the groove is open, if a rotational force accompanied by the vertical movement of the shaft 4 is transmitted to the pulley 5, it is easy to lift from the groove, and rotation accuracy It was hard to keep.

  The present invention solves the above-mentioned problems, and the object of the present invention is to pass through the frame side surface even if the vertical dimension of the opening of the frame is smaller than the diameter of the power transmission wheel integrated with the shaft end. A power transmission vehicle integrated shaft mounting device is provided which can be pivotally supported on the frame and can maintain sufficient strength and rigidity of the frame.

Another object of the present invention is to prevent shaft lifting and maintain rotational accuracy by simply adding a simple structure to the structure in which the shaft is rotatably supported by the groove-shaped bearing portion. Is to make it.
Furthermore, another object of the present invention is to provide a recording apparatus which can be assembled in a frame in a state in which the respective parts are previously unitized by providing the above-described mounting apparatus, and thus can be easily assembled and manufactured at low cost. Is.

  In order to achieve the above object, a first aspect of the present invention is a mounting device for pivotally supporting a shaft integrated with a power transmission vehicle on a frame in a state where the power transmission vehicle protrudes from an outer portion of the frame. In the frame, an opening for passing the power transmission wheel is punched and formed, and a lower end of the opening is communicated with the bearing, and an upper edge of the opening is formed on the upper edge of the opening. An overhang portion projecting outward from the side surface of the general portion is formed.

  According to the first aspect of the present invention, when the joint portion between the power transmission wheel and the shaft is rotated to the outside of the frame with the upper edge of the opening as a fulcrum, the amount of protrusion of the overhang portion at the upper portion of the frame is higher than in the conventional case. Can be added to the turning radius, so even if it is a large-diameter power transmission vehicle, even if the vertical dimension of the opening is reduced by that amount, it can be easily positioned outside the frame only by turning operation. In this state, the bearing is simply guided by dropping into the bearing portion. Further, since the vertical dimension of the opening can be relatively reduced, the frame strength and rigidity can be improved.

According to a second aspect of the present invention, in the first aspect, a power transmission vehicle is integrated, wherein parts are integrally assembled in advance on the inner side of the shaft divided by the frame. This is a shaft mounting device.
Therefore, according to the second aspect of the present invention, in addition to the operation and effect of the first aspect, the assembly of the shaft and the parts to the frame can be performed simultaneously by rotating the assembled parts together. It can be carried out.

  According to a third aspect of the present invention, in the first or second aspect, a bearing bush is fitted to the outer periphery of the shaft-facing position of the shaft so as to be relatively rotatable in the direction around the shaft and immovable in the axial direction. In addition, an arm protrudes from a side portion of the bearing bush, and a protrusion for positioning is provided on the arm so as to prevent an accompanying movement and a lift to be fitted into a positioning hole opened in the frame. It is characterized by this.

  According to the third aspect of the present invention, in addition to the function and effect of the first or second aspect, the shaft is rotatably supported by the bearing bush, and the arm positioning projection is fitted in the hole of the frame. As a result, the bushing accompanying rotation of the shaft is prevented, and at the same time, even if an external force that lifts the shaft is applied, it is supported so that it can rotate at a single point, thereby improving the rotation accuracy. .

According to a fourth aspect of the present invention, there is provided a pair of grooves according to the third aspect, wherein the means for fixing the bearing bush so as not to move in the axial direction is formed in a circumferential direction before and after the bearing bush fitting position of the shaft. And an E-ring that is elastically fitted into the groove and is prevented from being removed.
According to the 4th aspect of this invention, in addition to the effect in any one of the 1st thru | or 3rd aspect, fixation to the axial direction of a bearing bush is realizable with a simple structure.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the power transmission wheel is a timing pulley that rotates via a belt to a drive motor.
According to the fifth aspect of the present invention, in addition to the effects of any one of the first to fourth aspects, the power transmission can be performed smoothly, and the wound timing belt is connected to the upper side of the timing pulley. By adopting the passing configuration, a force that constantly presses the bearing portion from the upper side acts by the tension, so that the shaft can be prevented from being lifted by the power transmission mechanism itself.

  A sixth aspect of the present invention is the shaft according to any one of the first to fifth aspects, wherein the shaft is a shaft in which a plurality of discharge rollers are integrated, and the shaft is rotatably supported on both sides of the shaft. The discharge guide unit is assembled in advance, and the guide unit is arranged inside the frame in an assembled state with respect to the frame.

  According to the sixth aspect of the present invention, the recording apparatus includes the mounting device described in any one of the first to fifth aspects. Therefore, in the recording apparatus, the component for the frame in a unitized state. Assembling work can be performed at the same time, so that the assembling work can be easily performed while maintaining the strength and rigidity of the frame, and it can be manufactured at low cost.

The best mode of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is an overall perspective view of the internal structure of the ink jet recording apparatus according to the present invention excluding the exterior housing, as viewed from the paper discharge end side. In FIG. 1, this recording apparatus (hereinafter abbreviated as “apparatus”) 10 includes an apparatus main body (hereinafter abbreviated as “main body”) 14 assembled on a mount base 12.

  The main body 14 is substantially rectangular by a pair of front and rear horizontal frames 16 and 18 arranged in the front and rear in the main scanning direction which is the horizontal direction, and a pair of main frames 20 and 22 arranged on both sides in the sub scanning direction which is the front and rear direction. A platen 24 that supports paper as a recording medium is fixedly disposed on the bottom side of the platen 24, and an upper portion of the platen 24 is directed from one end to the other end in the main scanning direction. A carriage 26 that is guided so as to be reciprocally movable is disposed.

A recording head (not shown) is disposed below the carriage 26, and the platen 24, the carriage 26, a recording head (not shown), and the like constitute a recording unit.
The sheet fed from the rear sheet feeding side onto the platen 24 is recorded by the reciprocating movement of the carriage 26 in the main scanning direction, and is conveyed in the sub-scanning direction by a conveying roller (not shown) that rotates in synchronization therewith. And is discharged onto a discharge tray on the discharge end side of the mount base 12 through a discharge unit 28 disposed in front of the platen 24 and a lower portion of the front horizontal frame 16.

  The paper feeding mechanism for feeding and discharging is collectively driven by a paper feeding or conveying drive motor 30 fixed inside the front portion of one main frame 20 via a timing pulley and a timing belt. That is, a small-diameter timing pulley 32 that is linked to the drive shaft of the drive motor 30 protrudes from the outer portion of the main frame 20, and a large-diameter conveying link connected to the conveying roller at the rearmost portion of the main frame 20. A pulley 34 protrudes, and a large discharge pulley 36 connected to the tip of the discharge unit 28 protrudes at an intermediate position of the main frame 20, and a timing belt 38 is put between these pulleys 32, 34, 36. By rotating, the paper feeding operation is performed according to the driving of the motor 30.

  FIG. 2 shows a partial detailed configuration of the main frame 20. In FIG. 2, an opening 20 a is formed in the upper portion of the bearing portion of the discharge pulley 36, and the general portion of the main frame 20 is between the upper edge of the opening 20 a and the upper edge of the main frame 20. Further, an overhang portion 20b that protrudes outward by a predetermined dimension d is formed to protrude. The width dimension of the opening 20a is slightly larger than the diameter dimension of the discharge pulley 36, but the vertical dimension can be made smaller than the conventional one in accordance with the protruding amount d of the overhang 20b, thereby ensuring the strength and rigidity of the frame 20. It is supposed to be.

  In the lower part of the opening 20a, an elongated shaft groove 20c for inserting and guiding a roller shaft 40 provided with the discharge pulley 36 at the shaft end is formed in the vertical direction. A bottom portion of the shaft groove 20c is used as a bearing portion, and a positioning hole 20d penetrating the inside and outside of the frame 20 is opened on one side surface thereof. The positioning hole 20d is formed immediately after the rear portion of the discharge pulley 36 to lift the bearing bush 42 (shown in FIG. 3) that is rotatably fitted to the outer periphery of the roller shaft 40 and to prevent rotation. It is.

  The mounting apparatus and mounting procedure of the bearing bush 42 and the fixing procedure of the discharge pulley 36 to the shaft end will be described with reference to FIG. As shown in FIG. 3A, a spline groove 40a is formed at the shaft end of the roller shaft 40, and a pair of mounting grooves 40b are formed at a predetermined interval below the spline groove 40a.

  First, if the E-ring 44 is elastically fitted to the lower mounting groove 40b via a mounting jig or the like, the E-ring 44 is retained by being fitted into the mounting groove 40b. Function as.

  Next, when the elastic washer 46 and the bearing bush 42 are fitted to the roller shaft 40 in this order, and finally the E-ring 44 is fitted and fixed to the upper mounting groove 40b, as shown in FIG. 3 (b). The axial fixation of the bearing bush 42 to the roller shaft 40 is completed, and the bearing bush 42 is supported around the roller shaft 40 so as to be relatively rotatable. The interval between the grooves 40b and 40b is such that when the upper E-ring 44 is fitted, it can be fitted into the groove 40b if it is pressed to such an extent that the elastic washer 46 is slightly elastically deformed. Set to interval.

  The bearing bush 42 is made of an engineering plastic that is rich in lubricity and durability. The bearing bush 42 is formed with flanges 42b on the upper and lower sides of a main body 42a that is formed by penetrating a shaft hole that is swept around the outer periphery of the roller shaft 40. An arm 42c protrudes from a part of the outer periphery of the main body 42a, and a positioning projection 42d is provided at the tip of the arm 42c. .

  After the mounting work of the bearing bush 42 and the washer 46, as shown in FIG. 3C, the discharge pulley 36 is fixed to the shaft end of the roller shaft 40 by heat caulking so that the roller shaft 40 and The assembly of the discharge pulley 36 is completed.

  The roller shaft 40 after assembly is assembled to the front edge of the discharging unit 28. FIG. 4 shows the mounting procedure. A pair of bearing pieces 28a and 28a for bearing the outer periphery of the roller shaft 40 in a sandwiched state are alternately formed on one end side of the front edge of the unit 28 in parallel. On the other end side, a bearing boss portion 28b that receives the shaft end of the roller shaft in an inserted state is integrated.

  The procedure for bearing-supporting the roller shaft 40 to the discharge unit 28 described above is as follows. First, as shown by the broken line in FIG. When the roller shaft 40 is swung around this point, and the roller shaft 40 is swung and pressed against the bearing surface of the other bearing piece 28a, the two bearing pieces 28a are fitted into the roller shaft 40 while being elastically distorted in the opening direction. Then, it returns elastically with a click sound, the roller shaft 40 is supported between both bearing pieces 28a, and is positioned parallel to the front edge of the paper discharge unit 28.

  Thereafter, as shown in FIG. 4B, if the roller shaft 40 is moved in the dropping direction and the other end side is fitted to the bearing boss portion 28b, a plurality of discharge units integrated on the outer periphery of the roller shaft 40 are obtained. With the roller 40c positioned at the normal position, the attachment of the roller shaft 40 to the discharge unit 28 is completed, and the roller shaft 40 is rotatably connected to the front edge of the discharge unit 28.

  The procedure for bearing the roller shaft 40 assembled integrally with the discharging unit 28 on the frame 20 will be described mainly with reference to FIG. As shown in FIG. 5A, this operation is performed with the discharge unit 28 in an inverted state (not shown), and the joint between the discharge pulley 36 and the roller shaft 4 is connected to the lower edge of the overhang portion 20b. As shown in FIG. 5 (b), the discharge pulley 36 is moved to the outside of the main frame 20 by rotating it clockwise toward the opening 20a with the contact position as a fulcrum (O). Protruding. That is, even if the vertical dimension of the opening 20a is smaller than that of the prior art, by adding the protrusion amount d of the overhang 20b to the turning radius, a sufficient space through which the discharge pulley 36 can be passed is formed.

  In this state, as shown in FIG. 2, the roller bush 40 is lowered along the shaft groove 20c, so that the bearing bush 42 provided on the outer periphery of the roller shaft 40 settles at the groove bottom. At the same time, although not shown, the discharge unit 28 is also installed at a regular position in the apparatus main body 14, and as shown in FIG. 1, the assembly to the apparatus main body 14 is completed.

  After the bottoming, the arm 42c of the bearing bush 42 is elastically deformed, and the positioning projection 42d provided at the tip of the arm 42c is opposed to the positioning hole 20d on the main frame 20 side, so that FIG. 5 (c) and FIG. As shown in an enlarged manner, the arm 42c is elastically restored, and its positioning projection 42d is fitted into the positioning hole 20d, so that the bearing bush 42 is prevented from rotating and lifted from the shaft groove 20c. 5 and 6, the positioning hole 20d is drawn in the lower part of the shaft groove 20c for convenience of explanation, but actually, it is opened on one side surface near the bottom of the shaft groove 20 as shown in FIG. ing.

  Further, as shown in FIG. 1, the timing belt 38 wound around the discharge pulley 36 moves while meshing with the upper side of the discharge pulley 36. A pressing force acts on the bottom side, and the rotational accuracy of the roller shaft 40 can be sufficiently maintained by the restraining force together with the positioning structure.

  In the above embodiment, the case where the present invention is applied to the recording apparatus has been described. However, it goes without saying that the present invention can be applied to other electronic devices, machinery, and apparatuses with other driving.

1 is an overall perspective view showing an internal structure of a recording apparatus according to the present invention. FIG. 2 is a partial perspective view showing an enlarged part of a main frame in the recording apparatus. (A)-(c) is a perspective view of the disassembly and assembly state which shows the attachment relationship of a roller shaft, a bearing bush, a roller shaft, and the discharge pulley. (A), (b) is a top view which shows the attachment relationship between the unit for discharge | emission and the roller shaft for discharge | emission. (A)-(c) is typical sectional drawing which shows the attachment procedure with respect to the flame | frame of the pulley shaft for the discharge. The expanded sectional view of the VI part in a circle of Drawing 5 (c). (A)-(c) is typical sectional drawing which shows the attachment procedure with respect to the flame | frame of the conventional pulley shaft.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Recording apparatus, 12 Mount base, 12a Paper discharge tray, 14 Apparatus main body, 16, 18 Horizontal frame, 20, 22 Main frame, 20a Opening part, 20b Overhang part 20c Shaft groove, 20d Positioning hole, 24 Platen, 26 Carriage, 28 paper discharge unit, 28a bearing piece, 28b bearing boss, 30 paper feed drive motor, 32, 34, 36 timing pulley (power transmission wheel), 38 timing belt, 40 roller shaft, 40a spline groove, 40b mounting groove, 40c discharge roller, 42 bearing bush, 42a main body, 42b flange, 42c arm, 42d positioning protrusion, 44 E-ring, 46 elastic washer

Claims (6)

A mounting device for pivotally supporting the shaft with the power transmission wheel on the frame in a state where the power transmission wheel protrudes from the outer side of the frame.
An opening for passing the power transmission wheel is punched and formed in the frame, and a lower end of the opening is communicated with a bearing portion, and the upper edge of the opening is outside the side surface of the general portion of the frame. A power transmission vehicle integrated shaft mounting device, characterized in that an overhang portion projecting on the shaft is formed.   2. The power transmission vehicle integrated shaft mounting device according to claim 1, wherein parts are integrally assembled in advance on the inner side of the shaft defined by the frame of the shaft. Mounting device   3. The power transmission vehicle integrated shaft mounting device according to claim 1 or 2, wherein a bearing bush is fitted on the outer periphery of the shaft at a position facing the bearing portion so as to be relatively rotatable in the direction around the shaft and immovable in the axial direction. In addition, an arm protrudes from a side portion of the bearing bush, and a protrusion for positioning is provided on the arm so as to prevent an accompanying movement and a lift to be fitted into a positioning hole opened in the frame. A power transmission vehicle integrated shaft mounting device characterized by that.   4. The power transmission vehicle integrated shaft mounting apparatus according to claim 3, wherein the means for fixing the bearing bush so as not to be movable in the axial direction is formed in a pair of circumferential directions before and after the bearing bush fitting position of the shaft. A power transmission vehicle integrated shaft mounting device comprising a groove and an E-ring that is elastically fitted into the groove and is prevented from being removed.   The power transmission vehicle integrated shaft attachment device according to any one of claims 1 to 4. The power transmission wheel integrated shaft mounting device, wherein the power transmission wheel is a timing pulley that rotates via a belt to a driving motor.   6. The shaft according to claim 1, wherein the shaft is a shaft in which a plurality of discharge rollers are integrated, and a discharge guide unit that rotatably supports the shaft is assembled in advance on both sides of the shaft. The recording apparatus is characterized in that the guide unit is arranged inside the frame in an assembled state with respect to the frame.

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